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Fig. 1


Theoretically computed frequencies of = 0, 1, and 2 modes as a function of radial order. At low order, the  = 1 modes have frequencies near those of radial modes. As the radial order increases, the  = 1 modes move towards positions approximately halfway between successive orders of the  = 0, 2 modes (asymptotic relation). This explains the frequency regularities seen in many δ Scuti stars, which seemingly are at odds with the asymptotic relation by a factor up to 2.

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